linux-kernel - Re: [alsa-devel] [PATCH V1 1/3] ASoC: fsl: Kconfig: remove dependence of SND_IMX_SOC for SND_SOC_IMX_PCM

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Date:	Tue, 19 Aug 2014 16:55:34 +0800
From:	Shengjiu Wang <shengjiu.wang@...escale.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
CC:	<fabio.estevam@...escale.com>, <sfr@...b.auug.org.au>,
	<alsa-devel@...a-project.org>, <timur@...i.org>, <arnd@...db.de>,
	<shc_work@...l.ru>, <tiwai@...e.de>, <Li.Xiubo@...escale.com>,
	<lgirdwood@...il.com>, <nicoleotsuka@...il.com>,
	<broonie@...nel.org>, <xobs@...agi.com>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH V1 1/3] ASoC: fsl: Kconfig: remove
 dependence of SND_IMX_SOC for SND_SOC_IMX_PCM_DMA

On Tue, Aug 19, 2014 at 10:45:04AM +0200, Lars-Peter Clausen wrote:
> On 08/19/2014 10:36 AM, Lars-Peter Clausen wrote:
> >On 08/19/2014 09:41 AM, Shengjiu Wang wrote:
> >>On Mon, Aug 18, 2014 at 06:52:46PM +0200, Lars-Peter Clausen wrote:
> >>>On 08/18/2014 10:38 AM, Shengjiu Wang wrote:
> >>>>Build kernel with SND_SOC_IMC_PCM_DMA=m && SND_IMX_SOC=n leads the
> >>>>following
> >>>>error:
> >>>>
> >>>>    sound/built-in.o: In function `fsl_sai_probe':
> >>>>>>fsl_sai.c:(.text+0x5f662): undefined reference to `imx_pcm_dma_init'
> >>>>    sound/built-in.o: In function `fsl_esai_probe':
> >>>>>>fsl_esai.c:(.text+0x6044b): undefined reference to `imx_pcm_dma_init'
> >>>>
> >>>>Most cpu driver in soc/fsl has use the function 'imx_pcm_dma_init' which is
> >>>>defined in imx-pcm-dma.c, so need to select SND_SOC_IMX_PCM_DMA, but it
> >>>>depends
> >>>>on SND_IMX_SOC, if SND_IMX_SOC=n, then SND_SOC_IMX_PCM_DMA will not be
> >>>>selected.
> >>>>So remove the dependence of SND_IMX_SOC for SND_SOC_IMX_PCM_DMA.
> >>>>
> >>>>Reported-by: kbuild test robot <fengguang.wu@...el.com>
> >>>>Signed-off-by: Shengjiu Wang <shengjiu.wang@...escale.com>
> >>>
> >>>Those if conditions where just added[1] by Arnd to avoid other build
> >>>failures. So just removing them again makes little sense.
> >>>
> >>>As far as I can see imx_pcm_dma_init() should be stubbed out when
> >>>SND_SOC_IMX_PCM_DMA is not selected. So what's going on here?
> >>>
> >>>[1]
> >>>http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ff40260f79dc0436604452bccd449bffd25ebafb
> >>>
> >>>
> >>Lars-Peter Clausen & Arnd
> >>
> >>The purpose of Arnd's patch is same with me, which is to resolve the build
> >>error when SND_SOC_IMX_PCM_DMA=m & SND_SOC_FSL_SSI/SAI/ESAI/SPDIF=y, the
> >>error is "undefined reference to `imx_pcm_dma_init'".
> >>But Arnd's patch didn't involve this situation that SND_IMX_SOC=n &
> >>SND_SOC_IMX_PCM_DMA=m.
> >
> >Having SND_SOC_IMX_PCM_DMA selected if SND_IMX_SOC is not selected makes no
> >sense. I think the proper fix is to find out why it is selected and make
> >sure that it is not selected when SND_IMX_SOC is not selected.
> 
> 
> I guess the issue happens if SND_SOC_FSL_ASOC_CARD=m and
> SND_SOC_FSL_{ESAI,SAI,SSI}=y. In this case the fix is simply to drop
> the select SND_SOC_IMX_PCM_DMA from SND_SOC_FSL_ASOC_CARD.
> 
> - Lars
>

Yes, you are right. Thanks. I will send another patch.

best regards
wang shengjiu 
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